Power systems and methods for a pipeline inspection apparatus

ABSTRACT

Systems and methods are provided for powering a pipeline inspection system. The system includes an induction generator extending along a radially curved plane. The induction generator having an outer surface and an opposing inner surface. The outer surface is positioned proximate to an inner surface area of a pipeline. The system also includes a controller circuit configured to generate a plurality of periodic waveform signals. The plurality of periodic waveform signals are received by the induction generator. The induction generator is configured to generate active power that charges an electric power source based on the plurality of periodic waveform signals and the inner surface area.

FIELD

Embodiments of the present disclosure relate to a pipeline inspectionsystem, and more particularly to systems and methods that power thepipeline inspection system.

BACKGROUND

Pipelines carry a pressurized fluid, such as hydrocarbon gases and oils,slurries, water, and/or the like for many times hundreds of kilometersbetween pumping stations. The pipeline may be exposed to extreme weatherthat includes a corrosive atmosphere, exposed to alkaline or acidiccontent in the soil, manufacturing defects, and/or the like.Additionally, the contents carried within the pipeline may not bebenign, but may be corrosive and/or abrasive.

It is known in the art to monitor the conditions of the pipelines bypassing a pipeline inspection system (PIS) commonly known as a “pig”within the pipeline. The PIS includes sensors and recording devices thatmonitor the pipelines for any defects. The components of the PIS aresupplied power by one or more electric power sources, such as batteries.Alternatively, a separate pig housing only batteries may be electricallycoupled to the PIS to provide power to the PIS within the pipeline.

Conventionally, when inspecting the interior of the pipeline, the flowof the medium being transported is used to drive forward the PIS withinthe pipeline. Due to the length of the pipeline (in many cases hundredsof kilometers), the electric power sources must provide a charge to thePIS during the entire length of the pipeline. Thus, large portions ofthe PIS are dedicated to housing the batteries, which can increase thesize and/or diameter of the PIS limiting which pipelines the PIS maytraverse through. Additionally, the amount of charge of the batterylimits the range of pipelines that can use the PIS.

BRIEF DESCRIPTION

In an embodiment a system (e.g., a pipeline inspection system) isprovided. The system includes an induction generator extending along aradially curved plane. The induction generator having an outer surfaceand an opposing inner surface. The outer surface is positioned proximateto an inner surface area of a pipeline. The system also includes acontroller circuit configured to generate a plurality of periodicwaveform signals. The plurality of periodic waveform signals arereceived by the induction generator. The induction generator isconfigured to generate active power that charges an electric powersource based on the plurality of periodic waveform signals and the innersurface area.

In an embodiment a method (e.g., for powering a pipeline inspectionsystem) is provided. The method includes determining a forward velocityof a pipeline inspection system (PIS) traversing within a pipeline,calculating at least one of a frequency, voltage, or current of aplurality of periodic waveform signals based on the forward velocity,and generating the plurality of periodic waveform signals. The pluralityof periodic waveform signals are received by an induction generator. Theinduction generator extending along a radially curved plane. Theinduction generator having an outer surface and an opposing innersurface. The outer surface is positioned proximate to an inner surfacearea of the pipeline. The method further includes receiving an activepower from the induction generator. The active power is based on theplurality of periodic waveform signals and the inner surface area. Themethod also includes utilizing at least a portion of the active power tocharge an electric power source of the PIS.

In an embodiment a system (e.g., a pipeline inspection system) isprovided. The system includes a support structure, and a plurality ofvessels mechanically attached to the support structure. At least one ofthe vessels having a sensor unit configured to measure a forwardvelocity of a pipeline inspection system (PIS). The system includes apower system mechanically attached to the support structure. The powersystem having an induction generator extending along a radially curvedplane. The induction generator having an outer surface and an opposinginner surface. The outer surface is positioned proximate to an innersurface area of a pipeline. The power system further includes acontroller circuit configured to generate a plurality of periodicwaveform signals. The plurality of periodic waveform signals arereceived by the induction generator. The induction generator isconfigured to generate active power that charges an electric powersource based on the plurality of periodic waveform signals and the innersurface area.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a pipeline inspection system, in accordance with anembodiment.

FIG. 2 illustrates a schematic block diagram of a power system of thepipeline inspection system shown in FIG. 1, in accordance with anembodiment.

FIG. 3 illustrates a peripheral view of an induction generator of thepower system shown in FIG. 2, in accordance with an embodiment.

FIG. 4 illustrates a cross section of the power system of a pipelineinspection system within a pipeline, in accordance with an embodiment.

FIG. 5 illustrates a flowchart of a method for powering a pipelineinspection system, in accordance with an embodiment.

FIG. 6 illustrates a peripheral view of the induction generator shown inFIG. 3 within a portion of a pipeline, in accordance with an embodiment.

DETAILED DESCRIPTION

Various embodiments will be better understood when read in conjunctionwith the appended drawings. To the extent that the figures illustratediagrams of the functional blocks of various embodiments, the functionalblocks are not necessarily indicative of the division between hardware(including circuitry). Thus, for example, one or more of the functionalblocks (e.g., processors, controllers or memories) may be implemented ina single piece of hardware (e.g., a general purpose signal processor orrandom access memory, hard disk, or the like) or multiple pieces ofhardware. Similarly, any programs may be stand-alone programs, may beincorporated as subroutines in an operating system, may be functions inan installed software package, and the like. It should be understoodthat the various embodiments are not limited to the arrangements andinstrumentality shown in the drawings. The sizes of the components shownin the drawings may not be to scale and/or may have different aspectratios.

As used herein, the terms “system,” “circuit,” “unit,” or “device” mayinclude a hardware and/or software system that operates to perform oneor more functions. For example, a device, unit, circuit, or system mayinclude one or more computer processors, microprocessors, fieldprogrammable gate arrays, integrated circuits, controllers, or otherlogic-based devices that perform operations based on instructions storedon a tangible and non-transitory computer readable storage medium, suchas a computer memory. Alternatively, a device, unit, circuit, or systemmay include a hard-wired device that performs operations based onhard-wired logic of the device. The device, circuits, or units shown inthe attached figures may represent the hardware that operates based onsoftware or hardwired instructions, the software that directs hardwareto perform the operations, or a combination thereof. The hardware mayinclude electronic circuits that include and/or are connected to one ormore logic-based devices, such as microprocessors, processors,controllers, or the like. These devices may be off-the-shelf devicesthat are appropriately programmed or instructed to perform operationsdescribed herein from the instructions described above. Additionally oralternatively, one or more of these devices may be hard-wired with logiccircuits to perform these operations.

As used herein, an element or step recited in the singular and proceededwith the word “a” or “an” should be understood as not excluding pluralof said elements or steps, unless such exclusion is explicitly stated.Furthermore, references to “one embodiment” are not intended to beinterpreted as excluding the existence of additional embodiments thatalso incorporate the recited features. Moreover, unless explicitlystated to the contrary, embodiments “comprising” or “having” an elementor a plurality of elements having a particular property may includeadditional such elements not having that property.

One or more embodiments of the inventive subject matter described hereinprovides power systems and methods for a pipeline inspection system(PIS). The systems and methods extract kinetic energy from the movingPIS to recharge the electric power source (e.g., one or more batteries)of the PIS. For example, the PIS traverses within a pipeline at aforward velocity. The PIS is propelled by the pressurized fluid (e.g.,hydrocarbon gases and oils, slurries, water, and/or the like) within thepipeline. A structure of the pipeline can be comprised of anelectrically conductive material such as aluminum, steel, copper, and/orthe like. The power system of the PIS may include an inductiongenerator, such as a linear induction generator, positioned proximate tothe pipeline. The power system is configured to power the inductiongenerator, which creates a magnetic field. The magnetic field generateseddy currents in the pipeline, which generates a force opposed to theforward velocity of the PIS. The forward velocity of the PIS generatesactive power within the induction generator, which is delivered to theelectric power source. For example, the active power is utilized by thepower system to charger the batteries of the PIS.

A technical effect of at least one embodiment herein includes reducingan amount of batteries for the PIS. A technical effect of at least oneembodiment herein includes augmenting and/or extending the operationaltime of the PIS within the pipeline.

FIG. 1 illustrates a pipeline inspection system (PIS) 100, in accordancewith an embodiment. The PIS 100 is shown having a generally cylindricalstructure. For example, the PIS 100 has a length extending along an axis108 that is greater than a diameter of the PIS 100. The PIS 100 includesa plurality of vessels 101-105 and a power system 120. At least aportion of the vessels 101-105 may be configured to acquire informationof a pipeline. For example, the vessels 103 and 104 may include aplurality of sensor units 154 movably mounted to the surface area of thevessels 103,105. The sensors units 154 may be ultrasonic sensors,temperature sensors, flow sensors, pressure sensors, and/or the likeconfigured to measure one or more characteristics of the pipeline and/orthe fluid traversing within the pipeline. Additionally or alternatively,the sensor units 154 may be speed sensors, positional sensors (e.g.,GPS), and/or the like configured to measure a one or morecharacteristics (e.g., a forward velocity) of the PIS 100.

Additionally or alternatively, a portion of the vessels 101-105 may beconfigured to guide the PIS 100 within the pipeline. For example, thevessels 101 and 102 may include a plurality of guiding flaps 156 (e.g.,skirts, wipers, cups, and/or the like) which may be made of a materialsuch as polyurethane. As the PIS 100 traverses within the pipeline theguiding flaps 156 deflect rearwardly, the outer peripheral edge of theguiding flaps 156 to be elastically biased to ride against the inside ofthe pipeline wall. For example, the guiding flaps 156 may be configuredto maintain a distance and/or gap between the PIS 100 and the wall ofthe pipeline as the PIS 100 traverses within the pipeline. The guidingflaps 156 may be semi flexible plastic discs that are designed to sealagainst the pipeline wall, which allow the pressure of the fluid withinthe pipeline to drive and/or propel the PIS 100 through the pipeline.

The plurality of vessels 101-105 and the power system 120 aremechanically attached and/or fastened to a support structure 150 to formthe PIS 100. For example, the support structure may extend through eachof the vessels 101-105 and the power system 120 along a length of thePIS 100. The support structure 150 may include one or more pivot points152. The pivot points 152 may be configured to allow portions of thesupport structure 150 to be radially displaced with respect to the axis108. For example, as the PIS 100 traverses within a curve of thepipeline, the pivot points 152 allow the PIS 100 to conform to thepipeline. The support structure 150 may house one or more electricalconductors, such as wires or cables, to electrically couple one or morevessels 101-105 to the power system 120. For example, the power system120 may deliver power (e.g., current, voltage) to one or more of thevessels 101-105 via the electrical conductors of the support structure150. In another example, the power system 120 may receive one or moresensor measurements from the vessels 101-105 via the electricalconductors of the support structure 150. Optionally, the power system120 may be configured to record the sensor measurements acquired by thePIS 100 in memory (e.g., the memory 206).

FIG. 2 illustrates a schematic block diagram 200 of the power system 120of the PIS 100, in accordance with an embodiment. The power system 120may include a controller circuit 202 configured to control the operationof the power system 120. The controller circuit 202 may include and/orrepresent one or more hardware circuits or circuitry that include, areconnected with, or that both include and are connected with one or moreprocessors, controllers, or other hardware logic-based devices.Additionally or alternatively, the controller circuit 202 may executeinstructions stored on a tangible and non-transitory computer readablemedium (e.g., memory 206) to perform one or more operations as describedherein.

The power system 120 includes an electric power source, such as one ormore batteries 208. The batteries 208 may be a lithium ion battery,lead-acid battery, nickel cadmium battery, and/or the like. Thebatteries 208 may be electrically coupled to windings 213-215 (e.g.,coils) of an induction generator 212, which allow active power generatedby the induction generator 212 to be received by the batteries 208. Forexample, the active power received by the batteries 208 is utilized tocharge the batteries 208.

Optionally, the active power is converted based on a predeterminedelectrical specification (e.g., a charging current, a charging voltage)that define electrical characteristics to charge the batteries 208. Thepredetermined electrical specification may be stored in the memory 206.For example, the predetermined electrical specifications may define aset of voltage and/or current parameters for charging the batteries 208.The conversion of the active power to the predetermined electricalspecifications may be based on electrical charging circuitry (not shown)interposed between the batteries 208 and the induction generator 212.For example electrical charging circuitry may include a capacitor bank,an inverter, a rectifier, one or more capacitors, a buck converter,and/or the like.

The controller circuit 202 may be electrically coupled to a signalgenerator 210. The signal generator 210 may be configured to generate aplurality of periodic waveforms that are received by the inductorgenerator 212. The plurality of periodic waveforms may be a digitalsignal (e.g., square wave) and/or analog signal (e.g., sine wave). Theelectrical characteristics (e.g., frequency, amplitude) of the periodicwaveforms may be defined by the controller circuit 202. It may be notedin other embodiments, the signal generator 210 may be integrated withand/or apart of the controller circuit 202. For example, the operationsof the signal generator 210 are performed by the controller circuit 202.

Each periodic waveform is delivered to a corresponding winding 213-215of the induction generator 212, and have a different phase with respectto each other such that each of the periodic waveforms are offset withrespect to each other (e.g., three phase system). For example, theperiodic waveform delivered to the winding 214 is offset relative to theperiodic waveform delivered to the winding 213 by one third of theperiod of the periodic waveforms. In another example, the periodicwaveform delivered to the winding 215 is offset relative to the periodicwaveform delivered to the winding 214 by one third of the period of theperiodic waveforms and the periodic waveform delivered to the winding213 by two thirds of the period of the periodic waveforms.

In connection with FIG. 3, the periodic waveforms delivered to thewindings 213-215 may be configured to generate a force opposed to aforward motion and/or velocity of the PIS 100. For example, thewaveforms may be utilized by the controller circuit 202 to generate amagnetic field emitted by the induction generator 212, which passes amagnetic flux to the pipeline creating the opposing force of the PIS100.

FIG. 3 illustrates a peripheral view 300 of the induction generator 212of the power system 120, in accordance with an embodiment. The inductiongenerator 212 includes a magnetic core 302, such as electrical steel,and/or the like. The magnetic core 302 having a length extending alongan axis 320 and a width aligned along a radially curved plane (e.g.,radially curved plane 412 of FIG. 4). The magnetic core 302 includes aseries of grooves 310-315 along an outer surface 306 of the inductiongenerator 212. The grooves 310-315 may be configured to fasten and/orallow the windings 213-215 to be positioned at least partially withinthe magnetic core 302. Additionally, the grooves 310-315 may define apole pitch of the induction generator 212 corresponding to the distancebetween two adjacent poles of the induction generator 212. In connectionwith FIG. 4, the magnetic core 302 may be configured to extend along theradially curved plane 412 that conforms to an inner surface area 410 ofthe pipeline 402.

FIG. 4 illustrates a cross section 400 of the power system 120 of thePSI 100 within a pipeline 402, in accordance with an embodiment. Thepipeline 402 may be electrically conductive. For example, the pipeline402 may be comprised of steel, aluminum, and/or the like. Opposing ends414 and 416 of the induction generator 212 extends along the radiallycurved plane 412. The radially curved plane 412 of the inductiongenerator 212 may be configured to be similar to and/or the same as acurve of an inner surface area 410 of the pipeline 402. For example, theradially curved plane is aligned with the inner surface area 410 of thepipeline 402.

The radially curved plane 412 may be configured to allow the outersurface 306 of the induction generator 212 to be uniformly proximate tothe pipeline 402 at a distance 406. For example, the distance 406between the outer surface 306 and the inner surface area 410 of thepipeline 402 is approximately the same along the outer surface 306.

Additionally or alternatively, the outer surface 306 does not extendalong an entire circumference of the inner surface area 410. Forexample, the outer surface 306 of the induction generator 212 isadjacent to a portion 418 of the circumference of the inner surface area410 of the pipeline 402.

The distance 406 may be defined by the controller circuit 202 using aradial actuator 204 (FIG. 2). For example, the induction generator 212may be mechanically fastened to the PSI 100 via a cylinder, which allowsthe induction generator 212 to move radially away or towards the supportstructure along an axis 408. The radial actuator 204 may be configuredto adjust a radial position of the induction generator 212 along theaxis 408 to adjust the distance 406.

In connection with FIG. 5, the controller circuit 202 may adjust thedistance 406 and/or the periodic waveforms delivered to the inductionmotor 212 to generate electric power to charge the battery and/or thecomponents of the PSI 100. For example, the controller circuit 202supplies periodic waveforms to the induction generator 212 that generatea travelling magnetic wave-field directed to the inner surface 410 ofthe pipeline 402. The magnetic wave-field having a different velocity(e.g., synchronous velocity) relative to a translational velocity (e.g.,a forward velocity) of the PIS 100 along the pipeline 402. For example,the translational velocity is greater than the velocity of the magneticwave-field. The relative difference in velocities between the magneticwave-field and the translational velocity, combined with theelectromagnetic force generated by the stator magnetic field and theeddy currents induced in the pipeline 402, creates electric power (e.g.,active power) that can be transferred to the batteries 208.

FIGS. 5 illustrates a flowchart of a method 500 for powering a pipelineinspection system, (e.g., the PIS 100, in accordance with an embodiment.The method 500, for example, may employ structures or aspects of variousembodiments (e.g., systems and/or methods) discussed herein. In variousembodiments, certain steps (or operations) may be omitted or added,certain steps may be combined, certain steps may be performedsimultaneously, certain steps may be performed concurrently, certainsteps may be split into multiple steps, certain steps may be performedin a different order, or certain steps or series of steps may bere-performed in an iterative fashion. In various embodiments, portions,aspects, and/or variations of the method 500 may be used as one or morealgorithms to direct hardware to perform one or more operationsdescribed herein.

Beginning at 502, the controller circuit 202 may position the inductiongenerator 212 based on the pipeline 402. For example, the controllercircuit 202 may instruct the radial actuator 240 to adjust a radialposition of the induction generator 212 along the axis 408. The radialposition is adjusted based on a diameter of the pipeline 402. Forexample, the radial actuator 240 may adjust the radial position of theinduction generator 212 to be at the distance 406 from the inner surfacearea 410 of the pipeline 402. By adjusting the radial position of theinduction generator 212, the radial actuator 240 allows the PIS 100 tobe positioned in multiple pipelines having different diameters.

At 504, the controller circuit 202 may determine a forward velocity ofthe PIS 100. The forward velocity of the PIS 100 is based on a flow rateof the fluid within the pipeline 402 propelling the PIS 100. Forexample, the flow rate of the fluid within the pipeline 402 may rangefrom 0.5 m/s to 10 m/s. The controller circuit 202 may determine aforward velocity of the PIS 100 based on one or more sensor measurementsreceived from the sensors units 154. For example, the controller circuit202 may determine a velocity of the PIS 100 based on a flow rate,measured by one of the sensor units 154, of the fluid traversing withinthe pipeline 402 and propelling the PIS 100. In another example, thecontroller circuit 202 may determine a velocity of the PIS 100 based onchanges in positional measurements of the PIS 100 measured by one of thesensor units 154 (e.g., GPS). In another example, the controller circuit202 may receive a sensor measurement of one of the sensor units 154representing a velocity of the PIS 100 traversing within the pipeline402.

At 506, the controller circuit 202 may determine if the forward velocityis above a predetermined threshold stored in the memory 206. Forexample, the predetermined threshold may be utilized by the controllercircuit 202 to verify that the PIS 100 has a velocity greater than zero(e.g., the PIS 100 is moving within the pipeline 402).

If the forward velocity is above the predetermined threshold, then at508 the controller circuit 202 may calculate a frequency of periodicwaveform signals to charge the batteries 208. The frequency of theperiodic waveform signals may be configured to generate an active powerfrom the induction generator 212, which may be used to charge thebatteries 208. As described above, active power is generated by theinduction generator 212 when a velocity of the PIS 100 is greater thanthe velocity (e.g., synchronous velocity) of the magnetic fieldgenerated by the induction generator 212. For example, the periodicwaveform signals are delivered to the windings 213-215 of the inductiongenerator 212, which creates a magnetic field. Based on conductivity ofthe pipeline 402 and proximity with the induction generator 212, themagnetic field of the induction generator 212 generates eddy currents inthe pipeline 402, which generates a force exerted on the inductiongenerator 212.

The velocity (represented as the variable v_(s)) of the magnetic fieldis defined based on a frequency (represented as the variable f) of theperiodic waveform signals and the pole pitch (represented as thevariable t_(p)) as defined in Equation 1. Based on the forward velocitydetermined at 504, the controller circuit 202 may calculate a frequencyresulting in the velocity of the magnetic field having a magnitude lessthan the forward velocity.

v _(s)=2·t _(p) ·f   (Equation 1)

FIG. 6 illustrates a peripheral view 600 of the induction generator 212within a portion of the pipeline 402, in accordance with an embodiment.A velocity vector 602 represents the forward velocity of the PSI 100(e.g., determined at 504) traversing within the pipeline 402, and avelocity vector 604 represents the velocity (e.g., synchronous velocity)of the magnetic field. The controller circuit 202 may calculate thefrequency of the periodic waveform signals based on a predeterminedvelocity gap 606 stored in the memory 206. The predetermined velocitygap 606 may represent a difference in magnitude between the velocityvector 602 and the velocity vector 604. Optionally, the predeterminedvelocity gap 606 may be based on a slip of the induction generator 212.Additionally or alternatively, the predetermined velocity gap 606 may bebased on previous operations of the PIS 100. For example, based on aprior pipeline traversed by the PIS 100.

The controller circuit 202 may calculate the frequency of the periodicwaveform signals to produce the velocity vector 604. The velocity vector604 having a magnitude that forms the predetermined velocity gap 606relative to the velocity vector 602. For example, as shown in FIG. 6,the controller circuit 202 may configure the periodic waveform signalsbased on the phases between the signals, to produce a magnetic fieldfrom the induction generator 212 resulting in a force exerted on the PIS100 that is opposed to the direction of the velocity vector 602.Additionally or alternatively, the controller circuit 202 may determinethe frequency of the periodic waveform to produce a velocity vector 604that has a magnitude less than the magnitude of the velocity vector 602,but in the same direction.

Additionally or alternatively, the controller circuit 202 may calculatean initial voltage (e.g., amplitude), current, and/or the like of theperiodic waveform signals. For example, the voltage and/or current ofthe periodic waveform signals effects a strength and/or amplitude of themagnetic field. The controller circuit 202 may calculate the initialvoltage and/or current based on an electrical resistivity of thepipeline 402. The electrical resistivity of the pipeline 402 may bestored in the memory 206. The voltage and/or current of the periodicwaveform signals adjust the amplitude of the magnetic field emitted bythe induction generator 212. The controller circuit 202 may configurethe initial voltage and/or current to be higher for pipelines having ahigher electrical resistivity relative to pipelines traversed by the PIS100 having a lower electrical resistivity. For example, the controllercircuit 202 may calculate the initial voltage and/or current with ahigher value for the pipeline 402 relative to the initial voltage and/orcurrent of a pipeline having a higher electrical resistivity.

The frequency, voltage and/or current of the periodic waveform signalsthat form the predetermined velocity gap 606 may be based on an initialor starting point for the controller circuit 202 to perform a MaximumPower Point Tracking (MPPT). For example, the operations at 510, 512,514 and 516 of the method 500 performed by the controller circuit 202may be utilized to determine a select frequency and/or amplitude (e.g.,voltage, current) of the periodic waveform signals that result in theinduction generator 202 generating active power higher relative to othercandidate frequencies and/or amplitudes of the periodic waveformsignals.

Returning to FIG. 5 at 510, the signal generator 210 may deliver theperiodic waveform signals to the induction generator 212. For example,the controller circuit 202 may instruct the signal generator 210 togenerate the periodic waveform signals having the frequency determinedat 510 and the initial voltage and/or current (e.g., amplitude). Thesignal generator 210 is electrically coupled to the windings 213-215,which may receive the periodic waveforms signals generated by the signalgenerator 210. The periodic waveform signals provide current to thewindings 213-215 of the induction generator 212, which creates amagnetic field. The magnetic field generates eddy currents in thepipeline 402, which may generate a force opposed to the forward velocityof the PIS 100 based on the frequency determined at 510. Based on thedifference in velocities, corresponding to the predetermined velocitygap 606, the induction generator 212 generates active power. The activepower is utilized by the controller circuit 202 to charge the batteries208 of the PIS 100.

At 512, the controller circuit 202 may monitor the active powergenerated by the induction generator 212. For example, the controllercircuit 202 may measure the power of the electrical conductors (e.g.,wires) electrically coupling the induction generator 212 to the signalgenerator 210 and/or the controller circuit 202 for a period of theperiodic waveform signals.

At 514, the controller circuit 202 may determine if a maximum activepower is being generated by the PIS 100. For example, the controllercircuit 202 evaluates the active power being generated by the inductiongenerator 202 relative to a prior values of the active power toconfigure the periodic waveform signals to operate the inductiongenerator 212 to an active power within a predetermined threshold of acalculated maximum active power point. Additionally or alternatively,the maximum active power point may correspond to a charging threshold.The charging threshold may be based on the predetermined electricalspecification (e.g., a charging current, a charging voltage)corresponding to an amount of power that can charge the batteries 208.

The controller circuit 202 may compare the active power generated by theinduction generator 202 to prior active power values generated by theinduction generator 202 stored in the memory 206. It may be noted forthe initial active power (e.g., active power based on the periodicwaveform signals calculated at 508), the prior active power value iszero. If the active power is below the prior active power value, thecontroller circuit 202 may determine that the maximum active power hasbeen reached at a prior electrical configuration (e.g., frequency,voltage, current) of the periodic waveform signals and proceed to 516.If the active power is above the prior active power value, thecontroller circuit 202 may determine that the maximum active power hasnot been reached at a prior electrical configuration (e.g., frequency,voltage, current) of the periodic waveform signals and proceed to 516.If the active power is at the prior active power value and/or at thecharging threshold, the controller circuit may determine that themaximum active power has been reached and proceed to 510.

At 516, the controller circuit 202 may dynamically adjust the frequency,voltage and/or current (e.g., amplitude) of the periodic waveformsignals to adjust the active power generated by the induction generator212 based on an MPPT strategy. For example, the controller circuit 202may iteratively adjust the frequency, voltage and/or current of theperiodic waveform signals by reducing the amount of adjustment of thefrequency, voltage and/or current until the maximum active power isreached at 514. In another example, the controller circuit 202 mayincrement the frequency, voltage and/or current of the periodic waveformsignals over time until the maximum active power is determined reachedat 514. It may be noted that other approaches to MPPT may be performedby the controller circuit 202 as known in the art.

Additionally or alternatively, the controller circuit 202 may determineif the pipe line 402 is conductive. For example, portions of thepipeline 402 may not be composed of a conductive element, such asplastic. When the induction generator 212 is positioned at the portionsof the pipeline 402 not composed of a conductive element, eddy currentswould not be generated in the pipeline 402 in response to the magneticfield generated by the induction generator 212. Without the eddycurrents generated within the pipeline 402, active power may not begenerated by the induction generator 212. If no active power isgenerated, the controller circuit 202 may determine that the pipeline402 is not conductive. For example, the controller circuit 202 mayinstruct the signal generator 210 to terminate the delivery of theperiodic waveform signals to conserve energy of the batteries 208.Optionally, the controller circuit 202 may instruct the signal generator210 to only deliver the periodic waveform signals during one or moretest cycles, until the controller circuit 202 determines the pipeline402 is a conductive surface. For example, during each test cycle thecontroller circuit 202 may measure the power of the electricalconductors (e.g., wires) electrically coupling the induction generator212 to the signal generator 210 and/or the controller circuit 202 for aperiod of the periodic waveform signals. If active power is detected,then the controller circuit 202 may determine that the pipeline 402 isconductive.

In an embodiment a system (e.g., a pipeline inspection system) isprovided. The system includes an induction generator extending along aradially curved plane. The induction generator having an outer surfaceand an opposing inner surface. The outer surface is positioned proximateto an inner surface area of a pipeline. The system also includes acontroller circuit configured to generate a plurality of periodicwaveform signals. The plurality of periodic waveform signals arereceived by the induction generator. The induction generator isconfigured to generate active power that charges an electric powersource based on the plurality of periodic waveform signals and the innersurface area.

Optionally, a frequency of the plurality of periodic waveform signals isbased on a forward velocity of a pipeline inspection system traversingwithin the pipeline.

Optionally, the outer surface is configured to cover a portion of acircumference of the inner surface area of the pipeline.

Optionally, the induction generator is configured to emit a magneticfield in response to the plurality of periodic waveform signals. Avelocity of the magnetic field may be based on a forward velocity of apipeline inspection system. Additionally or alternatively, the pluralityof periodic waveform signals are configured based on a maximum powerpoint tracking. Additionally or alternatively, the magnetic field isconfigured to generate a force exerted on the induction generator. Theforce may be opposed to the forward velocity.

Optionally, the system includes a radial actuator. The radial actuatormay be configured to position the induction generator at a radialposition relative to the inner surface area based on a diameter of thepipeline.

Optionally, the system includes a vessel having a sensor unit. Thesensor unit may be configured to measure a forward velocity of thepipeline inspection system.

Optionally, the induction generator includes a magnetic core with aplurality of groves and a set of windings, each winding is positionedwithin a corresponding grove.

In an embodiment a method (e.g., for powering a pipeline inspectionsystem) is provided. The method includes determining a forward velocityof a pipeline inspection system (PIS) traversing within a pipeline,calculating at least one of a frequency, voltage or current of aplurality of periodic waveform signals based on the forward velocity,and generating the plurality of periodic waveform signals. The pluralityof periodic waveform signals are received by an induction generator. Theinduction generator extending along a radially curved plane. Theinduction generator having an outer surface and an opposing innersurface. The outer surface is positioned proximate to an inner surfacearea of the pipeline. The method further includes receiving an activepower from the induction generator. The active power is based on theplurality of periodic waveform signals and the inner surface area. Themethod also includes utilizing at least a portion of the active power tocharge an electric power source of the PIS.

Optionally, the method includes emitting a magnetic field based on theplurality of periodic waveform signals. A velocity of the magnetic fieldmay be based on the forward velocity of the PIS. Additionally oralternatively, the magnetic field is configured to generate a forceexerted on the induction generator. The force may be opposed to theforward velocity. Additionally or alternatively, the method includespositioning the induction generator at a radial position relative to theinner surface area based on a diameter of the pipeline.

Optionally, the frequency is calculated based on a maximum power pointtracking.

Optionally, the method includes adjusting the frequency, voltage, orcurrent of the plurality of periodic waveform signals based on an amountof the active power relative to a charging threshold.

Optionally, the plurality of periodic waveform signals are generated ata different phase with respect to each other.

In an embodiment a system (e.g., a pipeline inspection system) isprovided. The system includes a support structure, and a plurality ofvessels mechanically attached to the support structure. At least one ofthe vessels having a sensor unit configured to measure a forwardvelocity of a pipeline inspection system (PIS). The system includes apower system mechanically attached to the support structure. The powersystem having an induction generator extending along a radially curvedplane. The induction generator having an outer surface and an opposinginner surface. The outer surface is positioned proximate to an innersurface area of a pipeline. The power system further includes acontroller circuit configured to generate a plurality of periodicwaveform signals. The plurality of periodic waveform signals arereceived by the induction generator. The induction generator isconfigured to generate active power that charges an electric powersource based on the plurality of periodic waveform signals and the innersurface area.

Optionally, a frequency of the plurality of periodic waveform signalsare based on a forward velocity of the PIS traversing within thepipeline.

Optionally, the outer surface is configured to cover a portion of acircumference of the inner surface area of the pipeline.

Optionally, the induction generator is configured to emit a magneticfield in response to the plurality of periodic waveform signals. Themagnetic field may be configured to generate a force exerted on theinduction generator. The force may be opposed to the forward velocity.

It should be noted that the particular arrangement of components (e.g.,the number, types, placement, or the like) of the illustratedembodiments may be modified in various alternate embodiments. Forexample, in various embodiments, different numbers of a given module orunit may be employed, a different type or types of a given module orunit may be employed, a number of modules or units (or aspects thereof)may be combined, a given module or unit may be divided into pluralmodules (or sub-modules) or units (or sub-units), one or more aspects ofone or more modules may be shared between modules, a given module orunit may be added, or a given module or unit may be omitted.

As used herein, a structure, limitation, or element that is “configuredto” perform a task or operation is particularly structurally formed,constructed, or adapted in a manner corresponding to the task oroperation. For purposes of clarity and the avoidance of doubt, an objectthat is merely capable of being modified to perform the task oroperation is not “configured to” perform the task or operation as usedherein. Instead, the use of “configured to” as used herein denotesstructural adaptations or characteristics, and denotes structuralrequirements of any structure, limitation, or element that is describedas being “configured to” perform the task or operation.

It should be noted that the various embodiments may be implemented inhardware, software or a combination thereof. The various embodimentsand/or components, for example, the modules, or components andcontrollers therein, also may be implemented as part of one or morecomputers or processors. The computers or processors may include acomputing device, an input device, a display unit and an interface, forexample, for accessing the Internet. The computer or processor mayinclude a microprocessor. The microprocessor may be connected to acommunication bus. The computer or processor may also include a memory.The memory may include Random Access Memory (RAM) and Read Only Memory(ROM). The computer or processor further may include a storage device,which may be a hard disk drive or a removable storage drive such as asolid state drive, optic drive, and the like. The storage device mayalso be other similar means for loading computer programs or otherinstructions into the computer or processor.

It is to be understood that the above description is intended to beillustrative, and not restrictive. For example, the above-describedembodiments (and/or aspects thereof) may be used in combination witheach other. In addition, many modifications may be made to adapt aparticular situation or material to the teachings of the inventionwithout departing from its scope. Dimensions, types of materials,orientations of the various components, and the number and positions ofthe various components described herein are intended to defineparameters of certain embodiments, and are by no means limiting and aremerely exemplary embodiments. Many other embodiments and modificationswithin the spirit and scope of the claims will be apparent to those ofskill in the art upon reviewing the above description. The scope of theinvention should, therefore, be determined with reference to theappended claims, along with the full scope of equivalents to which suchclaims are entitled. In the appended claims, the terms “including” and“in which” are used as the plain-English equivalents of the respectiveterms “comprising” and “wherein.” Moreover, in the following claims, theterms “first,” “second,” and “third,” etc. are used merely as labels,and are not intended to impose numerical requirements on their objects.Further, the limitations of the following claims are not written inmeans-plus-function format and are not intended to be interpreted basedon 35 U.S.C. §112(f), unless and until such claim limitations expresslyuse the phrase “means for” followed by a statement of function void offurther structure.

This written description uses examples to disclose the variousembodiments, and also to enable a person having ordinary skill in theart to practice the various embodiments, including making and using anydevices or systems and performing any incorporated methods. Thepatentable scope of the various embodiments is defined by the claims,and may include other examples that occur to those skilled in the art.Such other examples are intended to be within the scope of the claims ifthe examples have structural elements that do not differ from theliteral language of the claims, or the examples include equivalentstructural elements with insubstantial differences from the literallanguage of the claims.

What is claimed is:
 1. A pipeline inspection system (PIS) comprising: aninduction generator extending along a radially curved plane, theinduction generator having an outer surface and an opposing innersurface, the outer surface is positioned proximate to an inner surfacearea of a pipeline; and a controller circuit configured to generate aplurality of periodic waveform signals, wherein the plurality ofperiodic waveform signals are received by the induction generator andthe induction generator is configured to generate active power thatcharges an electric power source based on the plurality of periodicwaveform signals and the inner surface area.
 2. The PIS of claim 1,wherein a frequency of the plurality of periodic waveform signals isbased on a forward velocity of a pipeline inspection system traversingwithin the pipeline.
 3. The PIS of claim 1, wherein the outer surface isconfigured to cover a portion of a circumference of the inner surfacearea of the pipeline.
 4. The PIS of claim 1, wherein the inductiongenerator is configured to emit a magnetic field in response to theplurality of periodic waveform signals, a velocity of the magnetic fieldis based on a forward velocity of a pipeline inspection system.
 5. ThePIS of claim 4, wherein the plurality of periodic waveform signals areconfigured based on a maximum power point tracking.
 6. The PIS of claim4, wherein the magnetic field is configured to generate a force exertedon the induction generator, wherein the force is opposed to the forwardvelocity.
 7. The PIS of claim 1, further comprising a radial actuator,wherein the radial actuator is configured to position the inductiongenerator at a radial position relative to the inner surface area basedon a diameter of the pipeline.
 8. The PIS of claim 1, further comprisinga vessel having a sensor unit, the sensor unit configured to measure aforward velocity of the pipeline inspection system.
 9. The PIS of claim1, wherein the induction generator includes a magnetic core with aplurality of groves and a set of windings, each winding is positionedwithin a corresponding grove.
 10. A method comprising: determining aforward velocity of a pipeline inspection system (PIS) traversing withina pipeline; calculating at least one of a frequency, voltage, or currentof a plurality of periodic waveform signals based on the forwardvelocity; generating the plurality of periodic waveform signals, whichare received by an induction generator, the induction generatorextending along a radially curved plane, the induction generator havingan outer surface and an opposing inner surface, the outer surface ispositioned proximate to an inner surface area of the pipeline; receivingan active power from the induction generator, wherein the active poweris based on the plurality of periodic waveform signals and the innersurface area; and utilizing at least a portion of the active power tocharge an electric power source of the PIS.
 11. The method of claim 10,further comprising emitting a magnetic field based on the plurality ofperiodic waveform signals, wherein a velocity of the magnetic field isbased on the forward velocity of the PIS.
 12. The method of claim 11,wherein the magnetic field is configured to generate a force exerted onthe induction generator, wherein the force is opposed to the forwardvelocity.
 13. The method of claim 11, further comprising positioning theinduction generator at a radial position relative to the inner surfacearea based on a diameter of the pipeline.
 14. The method of claim 10,wherein the frequency is calculated based on a maximum power pointtracking.
 15. The method of claim 10, further comprising adjusting thefrequency, voltage, or current of the plurality of periodic waveformsignals based on an amount of the active power relative to a chargingthreshold.
 16. The method of claim 10, wherein the plurality of periodicwaveform signals are generated at a different phase with respect to eachother.
 17. A pipeline inspection system (PIS) comprising: a supportstructure; a plurality of vessels mechanically attached to the supportstructure, at least one of the vessels having a sensor unit configuredto measure a forward velocity of a pipeline inspection system (PIS); apower system mechanically attached to the support structure, the powersystem having: an induction generator extending along a radially curvedplane, the induction generator having an outer surface and an opposinginner surface, the outer surface is positioned proximate to an innersurface area of a pipeline; and a controller circuit configured togenerate a plurality of periodic waveform signals, wherein the pluralityof periodic waveform signals are received by the induction generator andthe induction generator is configured to generate active power thatcharges an electric power source based on the plurality of periodicwaveform signals and the inner surface area.
 18. The PIS of claim 17,wherein a frequency of the plurality of periodic waveform signals arebased on a forward velocity of the PIS traversing within the pipeline.19. The PIS of claim 17, wherein the outer surface is configured tocover a portion of a circumference of the inner surface area of thepipeline.
 20. The PIS of claim 17, wherein the induction generator isconfigured to emit a magnetic field in response to the plurality ofperiodic waveform signals, wherein the magnetic field is configured togenerate a force exerted on the induction generator, wherein the forceis opposed to the forward velocity.